Pneumatic tire and manufacturing method therefor

Abstract

To provide: a pneumatic tire that can avoid deformation or degradation of a sheet member due to heating during formation of a sealant layer and satisfactorily maintain appearance and performance thereof when the sheet member comprising a thermoplastic resin or a thermoplastic elastomer composition is located at a portion including a tread part; and a manufacturing method for the same.SOLUTION: A pneumatic tire comprises a tread part 1, a pair of side wall parts 2, and a pair of bead parts 3. In the tire, a sheet member 9 made from a thermoplastic resin or a thermoplastic elastomer composition in which elastomers are dispersed in a thermoplastic resin, is located at a portion including the tread part 1, meanwhile a sealant layer 20 is formed on a tire inner surface 10 in the tread part 1. A sealant in the sealant layer 20 is made from a silicone composition.SELECTED DRAWING: Figure 1

Claims

1. In a pneumatic tire having a tread portion that extends in the tire circumferential direction and forms an annular shape, a pair of sidewall portions disposed on both sides of the tread portion, and a pair of bead portions disposed on the inner side in the tire radial direction of these sidewall portions, while a sheet member made of a thermoplastic resin or a thermoplastic elastomer composition in which an elastomer is dispersed in the thermoplastic resin is disposed in a portion including the tread portion, a sealant layer is formed on the inner surface of the tire in the tread portion, and the sealant of the sealant layer is composed of a silicone-based composition. The pneumatic tire is characterized by this.

2. The pneumatic tire according to claim 1, wherein the silicone-based composition is a two-component curable silicone.

3. The pneumatic tire according to claim 1 or 2, wherein the sheet member constitutes at least a part of the inner surface of the tire.

4. The pneumatic tire according to any one of claims 1 to 3, wherein the sheet member is an inner liner layer that extends along the inner surface of the tire from one bead portion to the other bead portion.

5. The pneumatic tire according to any one of claims 1 to 4, wherein the thermoplastic resin or the thermoplastic resin of the thermoplastic elastomer composition contains an aliphatic polyamide.

6. The pneumatic tire according to any one of claims 1 to 5, wherein the contact angle α1 of water with respect to the inner surface of the tire and the contact angle α2 of water with respect to the sealant layer satisfy the relationship |α1 - α2| ≤ 30°.

7. A method for manufacturing a pneumatic tire according to any one of claims 1 to 6, after manufacturing a pneumatic tire excluding the sealant layer, when forming the sealant layer by applying a sealant composed of a silicone-based composition to the inner surface of the tire in the tread portion, the temperature of the sealant applied to the inner surface of the tire is made lower than 70°C. The manufacturing method of the pneumatic tire is characterized by this.

Images